A method for low-temperature water extraction of gallnut tree leaves

By employing low-temperature water extraction technology and graded pretreatment, the problems of incomplete extraction and resource waste of gallnut leaves have been solved, achieving efficient and stable tannin extraction and comprehensive resource utilization, which is applicable to industries such as pharmaceuticals, chemicals, food, and leather making.

CN122124496APending Publication Date: 2026-06-02GUIYANG JILONG TANNIN CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIYANG JILONG TANNIN CHEM
Filing Date
2026-03-25
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing gallnut leaf extraction technologies suffer from problems such as incomplete extraction, resource waste, poor product stability, high production costs, and insufficient environmental friendliness. In particular, high-temperature extraction can easily lead to tannin degradation and difficulties in solid-liquid separation.

Method used

A low-temperature water extraction method, combined with graded pretreatment, differentiated extraction parameters, pH control, and graded solid-liquid separation, along with low-temperature nitrogen protection, was adopted to achieve efficient extraction and resource utilization of gallnut leaves. This includes raw material grading and crushing, microwave cell disruption, low-temperature stirring, and graded solid-liquid separation.

Benefits of technology

It improves tannin extraction rate and product clarity, reduces production costs, enhances raw material utilization and product stability, adapts to the characteristics of different types of gallnut leaves, and meets the requirements of green chemical production.

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Abstract

This invention provides a method for low-temperature water extraction of gallnut leaves, comprising the following steps: first, crushing the raw material to obtain gallnut leaf powder; mixing the gallnut leaf powder with pre-cooled purified water to form a liquid; adjusting the pH of the liquid at low temperature and then extracting; separating the solid and liquid at a low temperature of 5-18°C to remove waste residue and obtain a refined extract; further concentrating and purifying the refined extract to obtain a tannin extract. This method for low-temperature water extraction of gallnut leaves improves the comprehensive utilization rate of raw materials, simplifies the production process, reduces production costs, and improves production efficiency. It is suitable for the high tannin content of leaves from *Populus tomentosa* and *Populus thunbergii*, enabling the efficient and green industrial utilization of these raw materials.
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